Fluorinated polymers having bisurethano side chains

ABSTRACT

Polymers of the formula   IN WHICH Rf is perfluoroalkyl of six to 12 carbon atoms, n is an integer of 1 to 4, m is 0 or 1 and x is a number of about 10 to about 300, are useful as water- and oil-repellent agents for fibrous materials, especially materials consisting of or containing cotton or wool. The agents are used in aqueous dispersions or solutions in organic solvents.

United States Patent Hahn et al. [451 Aug. 1, 1972 [54] FLUORINATED POLYMERS HAVING [56] References Cited BISURETHANO SIDE CHAINS UNITED STATES PATENTS 1 Inventors Helm!" Hahn, Burghausen, Salzach; 3,428,614 2/1969 Brownstein ...260/77.5 BB

Siegfried Rebsdat, Altotting; i f Burgku'chen A12; Primary Examiner-Lorraine A. Weinberger Ench schulerer Burghauseni Assistant Examiner-L. Arnold Thaxton Zach all of Germany Attorney-Connolly and Hutz [73] Assignee: Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius ABSTRACT & Brunning, Frankfurt/Main, Ger- Polymers of the formula many 22 F] d: A 15, 1969 Cm I 1 PP 850,643 Nn co-o cii, ,-i':iiou1 30 Forei n A lication Prior't D ta v 1 g pp ly a in which R, is perfluoroalkyl of six to 12 carbon Aug. 30, Germany ..P atom n an integer of 1 to 4 m is 0 or 1 and x is a number of about 10 to about 300, are useful as water- [52] U.S. Cl ..260/471 C, 260/775 MA and oil-repellent agents for fibrous materials, p 51] Int. Cl ..C07c 125/06 cially materials consisting of of containing cotton or [58] Field of Search ..260/471 C, 77.5 MA wool. The agents e used in q s d spe sions or solutions in organic solvents.

2 Claims, No Drawings FLUORINATED POLYMERS HAVING BISURETHANO SIDE CHAINS The present invention relates to polymers of the formula NCO NCO

whereas a compound of the formula NCO permits an oil-repellence value of 90.

It has now been found that still better .oleoand hydrophobic effects can be obtained using the polymers of the invention.

These polymers of the formula in which R, represents a perfluoroalkyl group of six to 12 carbon atoms, n represents an integer of 1 to 4, m stands for O or 1 and x for a number of about to about 300, can be prepared by reacting a compound of the formula in which R, and n have the meanings given above,

a. with allyl alcohol and polymerizing the hisurethanes thus obtained with a radical-forming catalyst, or

b. with a polyalcohol of the formula in which m and x have the meanings given above.

The reaction with the alcohol to yield the bisurethane is preferably carried out at temperatures of from about 20 to about 120 C, especially from about to about C. It is suitable to add catalytic amounts of a tertiary amine, preferably pyridine.

Depending on the catalyst used, the allyl-urethane is polymerized at temperatures of from about 50 to about 150 C, preferably from about 60 to about C.

The fluorinated isocyanate component is easily obtained by reacting the easily obtainable toluene-diisocyanate with fluorinated alcohols of the formula in which R, and n have the meanings given above. The reaction proceeds smoothly already at a temperature below 100 C. The polymerization of the unsaturated fluorinated diurethanes is initiated with the aid of known radicalic catalysts, such as azo-diisobutyric acid and the nitrile thereof, or of peroxides, for example benzoyl peroxide or diisopropylperoxy-dicarbonate.

The polymers obtained from the fluorinated isocyanate and the allyl alcohol are viscous resin-like products. When polyvinyl alcohol or polyallyl alcohol is used as the alcoholic component, dark resin-like products are obtained that are as the formerly mentioned products readily soluble in polar organic solvents, such as acetone or dimethylformamide. Such solutions in a concentration of up to at most 1 percent furnish oil-repellence values of to on cotton and wool, and thus are superior to hitherto known products. Their chemical constitution according to the indicated formulas can be established by infrared spectra.

The products of the invention are excellent hydroand oleophobizing agents for fabrics of any kind. Applied in an amount of only 0.01 percent by weight (calculated on the amount of the fabric to be treated) they already cause an oil-repellent effect; at 0.1 percent by 5 ton, the polymer containing the allyl group allows values to be obtained that are by about 10 units higher with regard to their oil-repellence on wool.

The following examples serve to illustrate the inven- 17.4 grams (0.1 mol) of commercial toluene-diisocyanate (distribution of isomers: about 80 percent of 2,4-toluene diisocyanate and about percent of 2,6- isomer) were added dropwise at 60 C to a solution of 40 g (0.1 mol) of l,l-dihydro-pentadecafluorooctan-l- 01 in 200 ml of dimethylformamide, and stirring of the mixture was continued for 1 hour at 85 C. Subsequently, 5.8 g (0.1 mol) of allyl alcohol in small portions and one drop of pyridine were added to the reaction mixture that had been cooled to 50 C, and then the reaction was allowed to continue for 1 hour, while stirring, at 80 85 C. The solvent was evaporated and a yellowish viscous oil of the composition NH-valence Amide band 1 Amide band II carbonyl ab- NH deformation vibration sorption (in cm) (in cm) (in cm") Substances known from 1700 1736 I600 1620 32503300 literature urethane polymer 1710 (KBr) 1740(CHC1,,)

When an amount 0.5 percent (calculated on textile material) was applied, the oil-repellence values ob tained were about on wool and on cotton.

EXAMPLE 2 0.1 mol of toluene-diisocyanate (distribution of isomers as given in Example 1) was added dropwise at about 60 C to a solution of 40 g (0.1 mol) of 1,1- dihydro-pentadecafluorooctan-l-ol in 200 ml of dimethylformamide, and stirring was then continued for another hour at 80 C. l 1 grams of a polyvinyl alcohol mixture (medium molecular weight 100,000) were added to the reaction mixture that had cooled to 50 C, and the temperature was raised to 80 C while stirring. The mixture was then allowed to stand for about 15 hours and the solvent was eliminated in vacuo. The solid residue was digested with acetone to remove the unreacted polyvinyl alcohol and then evaporated to dryness. There was obtained a brown viscous product, the 1 percent-solution of which in acetone imparted excellent oil-repellent properties to cotton and wool. In both cases, the oil-repellence index was 120. The infrared spectrum of the polymer (taken in substance) showed the following bands:

Amide band] 1,720 cm Amide band 11 1,600 cm NH-valence vibration 3,290 cm.

We claim:

1. A polymer consisting essentially of recurring units of the formula in which R, is perfluoroalkyl of six to 12 carbon atoms, 11 is an integer of l to 4, m is 0 or 1 and x is a number of about 10 to about 300.

2. The polymer as claimed in claim 1, wherein R,- stands for perfluoro-n-alkyl of six to 12 carbon atoms. 

2. The polymer as claimed in claim 1, wherein Rf stands for perfluoro-n-alkyl of six to 12 carbon atoms. 